Thyroid and Parathyroid Hormones
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4 Terms
What are the functions and effects of the thyroid hormone (T₃ and T₄)?
Type: Amino acid–based but acts like a lipid-soluble hormone
Function: Increases metabolism, energy use, heart rate, and body temperature
What is calcitonin and what does it do?
Produced by: Parafollicular (C) cells of the thyroid
Type: Peptide (amino acid–based)
Function: Lowers blood calcium levels by reducing bone breakdown and increasing calcium excretion by the kidneys
What is PTH and what does it do?
Parathyroid Hormone (PTH) is a protein hormone produced by the chief cells of the parathyroid glands.
Function: Increases blood calcium by:
Stimulating bone breakdown
Increasing calcium reabsorption in the kidneys
Enhancing calcium absorption in the intestines (via vitamin D)
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